Jeff Craig, 38, is the shadowy king of radio reviewing. From his base in Westport, Connecticut, he produces and distributes three daily review features, one each on movies, videos and CDs. But although his movie segment, Sixty Second Preview, is heard on 225 stations nationwide, chances are you know Craig better from the bold-faced blurbs that trumpet his opinions in countless movie ads. Craig, for example, called Passion Fish "a triumph," Shadow of the Wolf "spectacular," Love Field "fabulous" and Amos & Andrew "a hilarious & provocative comedy."

Actually, Craig didn't see any of those movies. Though he provides the on-...